/**
 * 
 */
package com.worksmap.core.interceptors;

import java.util.HashSet;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;

import com.worksmap.core.entity.User;
import com.worksmap.core.service.LoginService;

/**
 * 访问系统管理员相关controller时验证用户是否登录
 * @author jack
 * 2013.7.25
 */
public class SystemAdminInterceptor extends HandlerInterceptorAdapter {
	
	private final Logger logger = Logger.getLogger(this.getClass());
	/**
	 * 定义登录页面
	 */
	public static final String LOGIN_PAGE = "/jsp/manage/login_system.jsp";
	
	private static final Set<String> noMappingSet = new HashSet<String>();
	static{
		noMappingSet.add("/system");
		noMappingSet.add("/system/login");
		noMappingSet.add("/system/check");
		noMappingSet.add("/system/register");
		noMappingSet.add("/system/");
		noMappingSet.add("/system/login/");
		noMappingSet.add("/system/check/");
		noMappingSet.add("/system/register/");
	}
	
	@Autowired
	LoginService loginService;
	
	/** 
	 * Controller之前执行
     * 在业务处理器处理请求之前被调用 
     * 如果返回false 
     *     从当前的拦截器往回执行所有拦截器的afterCompletion(),再退出拦截器链 
     *  
     * 如果返回true 
     *    执行下一个拦截器,直到所有的拦截器都执行完毕 
     *    再执行被拦截的Controller 
     *    然后进入拦截器链, 
     *    从最后一个拦截器往回执行所有的postHandle() 
     *    接着再从最后一个拦截器往回执行所有的afterCompletion() 
     */  
	@Override
	public boolean preHandle(HttpServletRequest request,
			HttpServletResponse response, Object handler) throws Exception {
		logger.info("==============系统管理员访问：执行顺序: 1、preHandle================");  
		if(noMappingSet.contains(request.getRequestURI())){
			logger.info("请求系统管理员主页时无需验证用户是否登录");
            return true;   
        }  
        if(!loginService.isAdminLogined(request)){
        	request.getRequestDispatcher(LOGIN_PAGE).forward(request, response);
//        	response.sendRedirect(request.getContextPath() + LOGIN_PAGE);
//        	response.sendRedirect("photohouxuandetail.do?pid=");  
        	return false;   
        }
        User currentAdmin = loginService.getCurrentAdmin(request);
        request.setAttribute("currentAdmin", currentAdmin);
        return true;  
	}
	
	  //在业务处理器处理请求执行完成后,生成视图之前执行的动作   
    @Override  
    public void postHandle(HttpServletRequest request,  
            HttpServletResponse response, Object handler,  
            ModelAndView modelAndView) throws Exception {  
    	logger.info("==============执行顺序: 2、postHandle================");  
    }  
  
    /** 
     * 在DispatcherServlet完全处理完请求后被调用  
     *  
     *   当有拦截器抛出异常时,会从当前拦截器往回执行所有的拦截器的afterCompletion() 
     */  
    @Override  
    public void afterCompletion(HttpServletRequest request,  
            HttpServletResponse response, Object handler, Exception ex)  
            throws Exception {  
    	logger.info("==============执行顺序: 3、afterCompletion================");  
    }  

}
